I have been traveling lately. I visited my sister and Mom in Oklahoma.
My sister, who lives in a townhouse condo, had a persistent problem with folks traipsing across her porch–& setting off her security camera–& being just plain annoying as they went from a parking lot to other units. This is how she solved it. I helped her plant this mixture of succulents, rushes and annuals while I was visiting.
I think it is a lovely–effective– barrier.